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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f950af9f9099266d3d40797821981138ede1126e8c72d432ca8f86b35dad2d' 
  AND token = '/jWmOnxYEXO2BEa/hHQe6MYp7M3gp4+GGBCui8Y0Aks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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