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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ec93282c45c06cb195ae4d46a6635775e516bfdc38f0f0cfd273eea463c414' 
  AND token = 'aM9gXLJHvKjSWsooq1Rgne3F5E3UtXVgr6e3shKEL/8=' 
  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"
    }
  }
}