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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fef16005416b23384630f6426773fc0d20e686b6828e5e8679de31e3b66b69d' 
  AND token = 'FVSwpINWBgtoB0fThTS5c7AD0xg5obie4ap+TudgT7E=' 
  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"
    }
  }
}