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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b94c4466f8d924b60903bb93c5f8f31c616d15505f7c0e49c501ed8ae20cd3c9' 
  AND token = 'hCGI/w3lQTQg6P5UJtQEAG9AJW+7uCLBwoTz/e4I91I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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