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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167d50e6304f3446f4961c6e8059363e6e40c81b4564fd5de5954b6337f89213' 
  AND token = 'WpnQZxwiC5f14ODwbAsssupdAwZo79r19OwQ+Q/z5CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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