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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b2d408ac43ddc064a86addc040db012ab7bff95d2fc775d89e0dbd8fc26da4' 
  AND token = 'BRCLoxFHiE5OuNBCbLbjax3S1chN8cyj+wID4KNg0dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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