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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b035c08033e0134f166cdcdd6a9022cf097ce3dfa05505bff4b8a60ac2dfa782' 
  AND token = 'fqkNddbNDSCiqejaNn2Y93cocaty1S09VSpgRRLfnMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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