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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb250fe5f6050a4087c9bbe3adfa62f6aef2f9b6b2c2490e79bdd9292c76d82' 
  AND token = 'M3txqn43K9kuOMrD6SzzwLTxH124VQLL6XPdoLukUzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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