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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab04f804bd01c8bd6a9279c686eeb92d4358360f4214dac7d89bcfda3df2252d' 
  AND token = 'xBHnsg699Q4LE1Xioo/14EN3kYheLfQROl9v+DVHz5A=' 
  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"
    }
  }
}