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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '380cc1c3448f7f9b8d56f8eecca4c84df9ad804c4fc004faa197c82b243118dc' 
  AND token = 'uZBEgX16xUNf8c9Pbvf59sYnLdXbDMb+scw4XeItn/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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