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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7197a0f1eedfd121ad77159b3df7d41d9c874817e113dcfb9489245f1f99bdf' 
  AND token = 'QH/blwXBTnYk/Wn6W2eQiCtwFxnr9nry4PS63mlzG64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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