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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d2b54a222629254d3bce0117d300f7033ea8d73046c5596a032907c754f315' 
  AND token = 'KVLGZ8180FRIsM7/t/q7ZqVBllDuMe8z4BUyyVQja18=' 
  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"
    }
  }
}