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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0bba0dcf642da3ef969dcabc744aa1a10b8f2329419aec1ed4049f5943db00' 
  AND token = 'JUhG9c9c1wdzhg6CbZOvN0FW/AdCzFcOcykxwwxBJ9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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