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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5992e67b07b8082796409d4e6fd841a74abd6f8d64b39923fba2ffec3b5777c' 
  AND token = 'IzcW2PxbxhjKs57Th2iyheLiOGy1rebe43c5XQuSdMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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