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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6306fd33e061564b09848b92f2c9f020e483ccd2eac1fb97c09e1040ec9ae34' 
  AND token = '4Ox5KzSPsjwPPjEMgM2TxXY0Y445/35uMjF75y2fXY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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