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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48779bd5e46040cd06acdacd48d46423c4d508f6ffd269ff5726963958ca47b' 
  AND token = '2/6bMhsdT072euISK79JyvPCSP/Qyxvl1CwSYjVyoK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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