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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eeedff3a4a4c6675c053a48ae855361480ba460f0cec39e419ae4685c4445fa' 
  AND token = '202zrpVBHLM9GhfYgM5q4AoZgunI9acR7pWe60RH/V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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