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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a5e3553eb9eef8bc3123a81ac0952f6a23f49081bd73b374fb1d235098ba1d' 
  AND token = 'PnOOuUiXp0hl7IOz9Fz6iYcLCoat4BTiVchtg1a+/NI=' 
  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"
    }
  }
}