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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d3217687386a05ca8c02e1a4f41a21afb1ac0c40d9f97feb52057161cf439e' 
  AND token = '/m2MoIbamsQiMaST30N+a3CREmWddEZWO2Lyd06uTYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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