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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003e6412be6129c9bc5d0989247ef88e9eeef496d76b1652bd578d6b0245e692' 
  AND token = 'nQe+0EdwCIzHvDODRAn+Ba6B73n20XJ3W9tt0jCMCQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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