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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a091a06942ce7e0e1ac3796ae2e3afe802a03348a854cab1cc55b086656f2b3c' 
  AND token = 'Deq85TR7ex7VHY7cqUp+AMGZ79WsEqnMJMf9MQlWAyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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