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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf43a13e046f6814300c294d9d8a22822b83cbcf21b7542b606cfd74418678d2' 
  AND token = 'sNl1Q3zed2LD/4S7nm93hyVL7Xck1hs0qBqswN/N8Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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