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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee5022b0bcc1515ecf3fe7a62c4ce3bdca12bbb75ac213d4965a3c8abbabff2' 
  AND token = 'M6+0hWa6d2pT4XWAb+ICIe7G/WU139epsNxYoa9dT3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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