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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e17695068f1f451dd6f9d30d11d2b11d457f3799416aff2d3b6d5882b2499f' 
  AND token = '4iijBUBjFyctaYIb9b0DwpsJjvL+Wd0vQyGTG7wqTOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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