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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578e8cd2e1450355ad3c3f910391fe14b998cd5184254de9ec2e3ddfa9567438' 
  AND token = '7rJBO0UssRWCL6aius1ZIv7R3JeZqWchBKMlN0bAz5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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