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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d32528a9a877d2cf2f0ca2670fd6294647e02327645d7a318e51ebfa78254a' 
  AND token = 'VNrcHXCMsWHuU2Vbyv+P2rMtOlPK+Qai6T1lWjI/q3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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