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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71f992efbd497234c27ae1c8f268bba82f6441a55fe198cc8d005a4263193c0' 
  AND token = 'No4Ubh2a2wuuZ8Y8rorjzdw3S6gg7jso0NqNVFAo+Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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