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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4a75f115b5cc16c83b16fd49ec88a65085fcd2bb60b82b7172bb6f1c46fc65' 
  AND token = 'phM9TPAVJihPO0is6ZI/IwrgJaLCxwfg4cGrK8a0ltQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}