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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd026d0ae719db140328211ee39d968871283b16b4683ccc4e86caa2308ee4475' 
  AND token = '01vqDLj+COgNoCMG6raSUGIfgBYbTr2CycDen+Fvc+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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