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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb042c23a867b1f6eb865af4120735a36637a9db3abafa05a63fc4e1184630b' 
  AND token = 'bIq8o4W8zLM6hUikVq/CI4Na82PSXJemx0TniIDtm80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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