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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df68e01d385973bdbb257a105779f898b1d03386dba4764ee7302a4af23602f8' 
  AND token = 'dCZH45sAVqWG0RmjUzKxiSjsCDvVZ8E0eEtG3b2C52k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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