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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af74c0d3e288a4f0b1c8eb5499c7c79744671575b08d0869e8c6fee4713a36c8' 
  AND token = 'CSebjV0u87aHkkba7pT5a5YRL+I3xLrF/OtX7xus9mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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