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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77eb80d56b164a6dc3b19377947ab5a2e266c78764e7332b9ec407d1658dc85' 
  AND token = 'wLFWHoRQbL0owHZaErJ5VcKRNBW3oA2wEBwCLrg/vnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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