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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ee220d1d6b2202bebd24dad58c3ceb15bc140db3a582897adc986f6ff48de8' 
  AND token = '/zjePdEI9Em5a8sarF3VJ8L9t6fKzVKDPPJ9fWjlgig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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