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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b38d47ee160e6cc0f69244d35a2ce547ba68cd4830a4da445cf58f7f1e04119' 
  AND token = '4Mcf1j8dKiry5bqoDVPvCloLcKlaBHgg4ezH0vR0hkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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