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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fba7d16ca86c0e0acc62f0c74dec9f34213cf247e94a80c8ec0fbd5ff9935d9' 
  AND token = '1ZkjD2JDg5KOFh3b16sXZN+mw6FIe43j2W2niHq+Rrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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