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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a65b9b8cd2f713e5856ccd5de620d3d1f430ca509b8c1282825e1b53b4375f7' 
  AND token = 'jzesnRXUiuxIFQ02dVSswxn8hh3Kr3UnYNo74Vcn1EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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