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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2efe18f7a796f548bcc2c6ddad3106b24c415a8ddb9f4d170df5db7619dccbd' 
  AND token = 'hIGowN+LTsYP2LGWtuM3HkFBHCXh4cS3YxuyYhAgNGI=' 
  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"
    }
  }
}