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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89dcb69a57770bb25c8f0e2b58323d0dc62648a5b7238d0802f578daa71233c' 
  AND token = 'vvtFWBMUpcLxJWQo0zqnFblCJldlojD1lz1aU9rp5zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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