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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93bc06fcd5de34b0e3f72c2e674cc643dc4f696688c88bfaa7699a5e0fd410c' 
  AND token = '79zvWn8UxEkRfpCB3GO2gCpsEeGLXmWTfHxDJn1FRL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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