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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4abbf97dce1c6d2c7a1872891329c16228f4409b31184ddcabe745032ef245ba' 
  AND token = 'm3HQveGFodIDJyq5AaqGznlh1w2778f94Yp9MQz8idg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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