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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79fae6d7afca69222c5e1f28550e96663b8b2b523e2f9b93ec166a41012ab58a' 
  AND token = 't814H8ueCuTES0HxATo0RTCQkWoJRoPcaK8SVUh88CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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