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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b7dc110a36c4c9e07a8476dec3a0e265a4aaa52bbf97c72e08c45335e75257' 
  AND token = 'vVh0HIyok29Zc/Ta2gFXjGA3gvZOpJBld55+IMmQpPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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