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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab5d2f3d7ec3087e920be191777ec7cd6c37aa93ebc824ef8abaa92e713996c' 
  AND token = '5kFFKNCAVLgcLax2l1jYxf/B+/WGz0IVNJ58QE53V0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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