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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7e23199f356f934bbab88aa11eab0f11735a381d928f043fb69035b24c65ad' 
  AND token = 'v6ilsDTPeqF7vFlgL5RbSFziyp+Ag3v+5rTP/YTEB9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00369

JSON explain

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