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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d650eaeb886b0beaa2e8dce7f4ab90b0e8e7777569acd7090c3b2e7d6f496fd' 
  AND token = 'qcGv1KW0GILCvHAdoaQxmYnUW+dtXigq2wFG12pFltY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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