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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb039f6a9fe4df35a719e9d6e4bcbe28fd90a5a11ff76239cb0f14c7b2b3b373' 
  AND token = 'D4Bs9y0dUf1F+MnEMeKJcVIblj/HApwQRIQIK9yNn00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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