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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9e9b1c7647eb7bb938a6ab49c9d7e4d66bb4a64b2509cad1e75b8a7b54fb46' 
  AND token = '/hvlab8OCkA5UkYICGBsPps2FtAmIlYWaDSruLQ+EtM=' 
  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"
    }
  }
}