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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c621024c9ab3d7537a01d231b8784f04b96bda94fe2d08c560423a485fcdb82' 
  AND token = 'Nu0F2jebKJV5CDhMPr00Cgkxkb5TcPu3M8Gd0/+CAfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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