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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3093ddbb0960e7a5fe9d1f76a2c2923084d8b8dae383988c2ca6d028f721a4ae' 
  AND token = 'ZKRWPKiPN9/frHTSKsiBIAU5xe/PhDHGrEstLy+d38c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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